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Search Again :: Adv Search 1000 results in 0.027s
<1…18192021222324…34>
  • Kempston (joystick) keyboard??Dear all, I am playing with an idea to have a Kempston keyboard. The wiring would be the same as Kempston Joystick to meet its standart, so that all…

    ... have an interface board with 8 joystick sockets on it. ... would ignore the high byte and just use the ... Then you could plug in 8 joysticks, or you could ... that operates Up/Down/Left/Right/Fire on one port, ... game.

    With 8 connectors there would be enough ...
    Hood Hood June 2013 Hardware
  • Microdrive Serial ProtocolGentlemen, I've been dreaming for a long time to develop a Microdrive emulator, where an SD card loaded with .MDR cartridge images can be accessed t…

    ... if you determine what byte is being sent or ... an 8 bit register, then start shifting in the next byte. ... to have a one byte buffer at most at ... signal is right and the timings are right and nothing ... if this is even the right approach.
    For documenting ...
    Winston Winston June 2013 Hardware
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... mistake in interpretation of this byte :)

    Could ... interpret byte 19...
    Very strange... So, what is right way ... br /> 0 1 byte I
    1 8 word HL',DE',BC ...
    ZXMAK ZXMAK July 2013 Emulators
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... 0 of the interrupt flags byte. It can be found at ... emulator: XZX 2.8.1. Its interrupt flag byte is 4; it ... (the attributes in the bottom right-hand corner of the screen ... bit 0 of the flag byte as IFF1, I suspect it ...
    John Elliott John Elliott July 2013 Emulators
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... 0 of the interrupt flags byte. It can be found at ... emulator: XZX 2.8.1. Its interrupt flag byte is 4; it ... (the attributes in the bottom right-hand corner of the screen ... bit 0 of the flag byte as IFF1, I suspect ... with attributes on the bottom right corner :smile:
    ZXMAK ZXMAK July 2013 Emulators
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... 48K machines. The hardware scroll is feasible in 48K ... a good 50pfs smoth scroll you need a shadow ... screen, so you have 8 entire frames to update the ... to software-scroll the static area back into the right position. ... me to apply hardware scroll only from X line ...
    antoniovillena antoniovillena July 2013 Development
  • Full 16*16-digit BASIC multiplicationI liked Andre Adrian's 32-bit long multiplication routine so much that I decided to a decimal version. After all, 2^63 is only 9223372036854775808, a…

    ... digits in from the right; but it can be ... /> ;transfer the 8 BASIC variables into 8*2-byte registers
    ... ld a,(hl) ;A =exponent byte
    or a
    ... GKHL00

    PADSTR: ;right-justify and left zero-pad ...
    Battle Bunny Battle Bunny July 2013 Sinclair Basic
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... /> jr .read_byte ; fetch the next byte

    .verify_checksum:
    ... a tape error
    rst 8 ; error restart
    defb ... loading error"[/CODE]

    Right, so where next?

    stephenw32768 stephenw32768 August 2013 Development
  • BIFROST* example: "Knights & Demons DX" source codeA package containing the source files of our multicolor game "Knights & Demons DX" is now available for download [URL="http://www.mediafire.com/?hbch…

    ... /> changeTileNow(px, py, tile+8) ' knight transformed into demon
    right of the specified position (if ... AS UBYTE) AS BYTE
    DIM delta AS BYTE ' variation in ...
    Einar Saukas Einar Saukas August 2013 Development
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    ... scroll a full 32 character line 2 pixels to the right ... vacated by the 2 right shifts. Repeat 8 times for one ...
    SCROLL2RR:
    ld c,8
    ld hl,16384
    ld b,8
    PIXROWPP:
    pop hl ...
    Battle Bunny Battle Bunny August 2013 Development
  • Bug in Super Wonder Boy in Monsterland?Hello!:smile: This game seems to have a bug that prevents finalize. The dragon that is in the last level, it is impossible to kill.Remains static.No…

    ... defb $23 ;correct victory message scroll screen address

    ... dragon corruption (see above for right facing fix)
    ;=============================================================================
    right if dragon facing right (points to 5,6,7,8)< ...
    Ralf Ralf August 2013 Games
  • Multicolor chess?I thought multicolor chess pieces would be a good idea, since it's easy to fit a 8x8 chessboard within the 9x9 tile area of BIFROST*. However this tu…

    ... in distinguishing between left and right as the possible moves ... of the 32 pieces are /right now/ as well. So ... all the data in a byte anyway.
    [/QUOTE]
    ... by the schema above, in 8 bits. It assumes a ... of where each piece is right now, of course - but ...
    Gedlion Gedlion September 2013 Development
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... design, it get/send a byte every 16 clock cycles so ... 'm a little in the right direction: it sounds like a ... the current rises to about 8 mA.
    Is that no ...
    bverstee bverstee September 2013 Hardware
  • The making of R-Type on the speccy book, free downloadBob Pape, the guy who wrote R-Type on the speccy has made his book, "IT'S BEHIND YOU: the making of a computer game", available for free download: [u…

    ... 's true for most 8-bits and you usually ... the Atari 8-bit has fine and coarse hardware scroll and a ... there's ways to smoothly scroll bitmaps [i]really[/i] ... or even overscanned smooth scroll can be done in ... sit on 64 byte boundaries so the last byte is never ...
    TMR TMR September 2013 Games
  • I have done a Spectrum Screen Design Template As PDFI use this for my games, to work out attribute and screen addresses. It is A4, to be printed landscape [url="http://www.peargames.co.uk/downloads/s…

    ... 7

    8 18432 +2K 18688 18944 19200 ... 19712 19968 20224 22784 8
    9 18464 ... $58E0 7

    8 $4800 +2K $4900 $4A00 $ ... $4D00 $4E00 $4F00 $5900 8
    9 $4820 $4920 ... works from right-to-left within that byte to set ...
    joefish joefish September 2013 Development
  • display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…

    ... pixels in a byte
    1005 DIM b(8)
    1010 FOR ... /> 1110 LET xc=INT(x/8): REM Location of X character ... l=INT(yc/8): REM Bit shift 3 places right for LHS ... of row
    1160 LET r=yc-(l*8 ... LET v=INT(byte/b(idx)): REM right shift required bit to ...
    JonB JonB October 2013 Sinclair Basic
  • What would you do with four joysticks?Anyone got some inspiring ideas for four-player games, or twin-stick two-player games..? I can think of, for four players: [I]Warlords[/I] (Atari) […

    ... colours. That way they could scroll downwards just by moving the ... are notoriously difficult to get right in platform games, though if ... . a fixed number of sprites, 8 or 12 max) then it ...
    joefish joefish October 2013 New game ideas
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... /> call fp_to_a ; get data byte (bit 7 ignored)
    push ... /> call fp_to_a ; get register byte
    cp 17 ; check ... L
    srl l ; shift right logical
    srl l ; ... state delay
    nop ; 8 t-state delay
    nop ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ; -----------------------------------------------------------------------------

    ; THE 'SCROLL BUFFER' SUBROUTINE
    org 0x2571 ...
    and %00000011 ; byte
    xor %01011000 ; ... org 0x267c
    defs 8, 255 ; unused locations ( ...
    chev chev October 2013 Development
  • IF EXIST?In MS-DOS scripting, there is an IF EXIST command that lets you check wether a file exists in disk or not. There are any way to check it out from BA…

    ... , i refer you to Chapter 8, part 27 of the manual ... from the manual:
    (Chapter 8, part 26 [url]http://www ... configuration is illustrated below
    (right).

    In BASIC (using ...
    The_Bert The_Bert October 2013 Sinclair Basic
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ...
    ld (scr_ct), a ; set scroll count
    res 0, (iy ... channel
    inc hl ; high byte of output routine
    inc ... ; address attr-t
    cp 8 ; 0 to 7?
    jr ... /> jr z, co_temp_a ; jump with 8
    or b ; else apply ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... CLUT bits
    cp 8 ; CLUT 8?
    jr z, ... plot_loop:
    rrca ; shift right
    djnz plot_loop ; loop ... pos_1:
    ld b, 8 ; 8 bytes to write

    byte
    call fp_to_bc ; x coord ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... destination
    ld bc, 64 ; byte count
    ldir ; copy bytes ... ld c, 168 ; 21 characters, 8 bytes each
    ldir ; ... br /> ld a, 25 ; scroll counter value
    sub (iy ...
    ld bc, 3 ; byte count
    bit 7, (hl ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... call scrl_lp ; scroll required lines
    defb po_right - $ ; right
    defb po_quest - $ ... ; test for 8-bit ASCII
    chev chev November 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... bc ; unstack byte count
    right
    and ... ld a, 8 ; pixel ...
    chev chev November 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... /> .ifdef ROM1
    ldir ; scroll pixel line in graphics mode ... 8 * INT (A/8)
    .ifdef ROM0
    or 0xc0 ; most significant byte ...
    chev chev November 2013 Development
  • Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…

    ... I was putting mine right at the top of the ... means the least significant byte of the address has to ... with all the same byte. If that byte is in hex ...
    This 257-byte table containing the same byte has to be ... z80 is expecting an 8-bit peripheral ID when an ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Development
  • Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…

    ... number, extending
    ; from right to left. Similarly, the decimal ... = ( ( ( o(1) *8+o(2) )*8+o(3) )*8 ... +o(n) )
    8
    ld hl,65535< ... ;length of binary string (1 byte per bit)
    BIN2040: ...
    Battle Bunny Battle Bunny November 2013 Development
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